Fix issue 6: Add random ball release x velocity
Merge pull request #8 from nsue/fix-issue-6

Fix issue 6: Add random ball release x velocity
able to see the ball release movement from other clients
able to see other clients' ball collision with bricks and paddles
client is able to enter mid-game and see the correct position and velocity of other client's ball (only for 2 players)
remote balls are assigned to remotePlayers object, balls are synced between 2 players
removed remoteBall variable from the outermost scope
fixed bug where existing player balls are duplicated
client's remote ball is killed when disconnected, only works for 2 players
fixed bug where player was not removed from remotePlayers when disconnected
implemented don's fix for onremoveplayers, balls are now synced across multiplayers
remove event handler: kill disconnected ball
fixed bug where remotePlayerBall is called in onBrickKillToOtherClients when it is still undefined
uncommented closure on game.js
added createRemoteBall helper
fixed bug: wrong operator
merged with master
resolved conflicts